The only good news in this whole project was that the valance at the top front of the cab had a little gap that I could slip the foamboard into that would hold the front of the headliner board up. I slid the foamboard in, and bent the back end down to the mounting rail in the back. I needed to make a more vertical section to get the back of the board as high up to the roof as I could, so I bent the foamboard using an industrial heat gun. I screwed a heavy cardboard tube over the foamboard to hold it down and have a round edge to bend the foamboard to. To be able to bend the whole 48" width at one time, I screwed a scrap end of OSB to the foamboard to give me some leverage. Then I propped the foamboard up to vertical and heated the foamboard until it held the vertical shape I wanted.
No one lives forever, the trick is creating something that will.
Last edited by DanTwoLakes; 10-17-2012 at 04:39 PM.